# CVE-2024-36309: AMD Northbridge IO missing lock bit protection in remapping

Source: https://junglewise.ai/threats/cve-2024-36309-missing-lock-bit-protection-in-the-northbridge-io-nbio-could  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2024-36309 · Severity: info · Published 2026-11-10

AMD processors contain a missing lock bit protection mechanism in the Northbridge IO (NBIO) component that could allow a privileged attacker to re-map device memory access. An attacker with elevated privileges could use this to bypass security controls and potentially expose, modify, or disrupt data on systems using affected AMD processors.

Vendors: [Amd](https://junglewise.ai/threats/vendors/amd).

## Quick answers

**Is CVE-2024-36309 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-36309 being exploited in the wild.

**How severe is CVE-2024-36309?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** AMD Northbridge IO.

**Is there a fix for CVE-2024-36309?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2024-36309 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2024-36309?** Check whether you run Amd Northbridge IO. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The NBIO lacks proper lock bit protection, allowing a privileged attacker to re-enable intentionally disabled devices through a remapping attack. This is a hardware-level vulnerability affecting memory access controls. Exploitation requires privileged access and could impact data confidentiality, integrity, or availability depending on the device being remapped.

## Affected products

- AMD Northbridge IO

## Timeline

- 2026-11-10: disclosed

## References

- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3051.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3051.html)
- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4018.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4018.html)